Loading DevTools...

DevTools

Essential utilities for developers

Home

DevTools One

Free online developer utilities to streamline your workflow

Essential Web Development Tools in One Place

DevTools provides free, browser-based utilities for developers, data analysts, and IT professionals. Our tools process everything locally in your browser - no data is sent to servers, ensuring complete privacy and security.

JSON & Code Tools

Format, validate, and compare JSON. Format HTML, CSS, JavaScript, and SQL with syntax highlighting. Fix code formatting issues instantly with our powerful beautifiers.

Try JSON Beautifier

Encoders & Converters

Convert data between formats with Base64, URL encoding/decoding, hash generation, and JWT tools. Transform colors between HEX, RGB, and HSL formats effortlessly.

Try Base64 Converter

Generators & Utilities

Create UUIDs, manage timezone conversions, work with unix timestamps, build cron expressions, and compare text differences without installing any software.

Try UUID Generator

Why Choose DevTools for Web Development?

Privacy & Security First

Unlike many online tools, DevTools processes everything directly in your browser. Your data never leaves your computer, making it perfect for sensitive information and compliance requirements.

Works Offline

Once loaded, all tools function without an internet connection. Perfect for developers working in environments with limited connectivity or on-the-go.

Designed for Developers

Our intuitive interface was built by developers for developers, with common tasks and workflows in mind. Save time with our carefully crafted tools that solve real-world development challenges.

Comprehensive Toolset

From data formatting to encoding, conversion, and generation tools, DevTools offers a wide range of utilities for front-end, back-end, and full-stack developers.

Free & Open Source

All tools are completely free to use without limitations. No account registration, no hidden fees, no premium features - just practical developer tools when you need them.

Regular Updates

We continuously improve our tools based on developer feedback, modern web standards, and emerging technology requirements to meet your evolving needs.

Explore All Developer Tools

Access these powerful web development utilities directly in your browser without installation. All tools are free, secure, and built for optimal performance.

Data Formatters

Text Tools

Encoders & Decoders

Converters

Date & Time Tools

Image Tools

Frequently Asked Questions

Is my data secure when using DevTools?

Absolutely. All processing happens directly in your browser - your data never leaves your computer. No server processing, no data storage, complete privacy.

Do I need to create an account?

No accounts needed. DevTools is completely free to use without any registration requirements. Just visit the site and start using the tools immediately.

Which browsers are supported?

DevTools works with all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. We recommend using the latest version for the best experience.

Start Using DevTools Today

Join thousands of developers who trust our tools for their daily coding tasks. No registration, no installation, no limits.

JSON Beautifier & Formatter

Format and prettify messy JSON data with proper indentation and structure. Makes complex JSON data readable and easier to understand with instant validation and error highlighting.
Keywords: JSON beautifier, JSON formatter, JSON pretty print, JSON validator, format JSON online, JSON parser

Input JSON

Formatted JSON


                            

                                
                                
                            

                        

                    

                

            

              
            

                
UUID Generator

                

                    
Generate universally unique identifiers (UUID) v1, v4, and v5. Batch generation, multiple formats, and instant copy. Perfect for database keys and unique identifiers.

                    
Keywords: UUID generator, GUID generator, unique identifier, UUID v1, UUID v4, UUID v5, universally unique identifier

                

                

                    

                        
UUID Configuration

                        

                            
                            
                        

                        

                            
                            
                        

                        

                            
                            
                        

                        

                            
                        

                    

                    

                        
Generated UUIDs

                        

                        

                            
                            
                        

                    

                

            
            
            

                
URL Encoder/Decoder

                

                    
Encode and decode URLs and URI components. Convert special characters for web-safe URLs. Essential tool for query parameters and API endpoint handling.

                    
Keywords: URL encoder, URL decoder, URI encoder, percent encoding, URL encoding, web safe URLs

                

                

                    

                        

                            
URL Input

                            
                            

                                
                                
                                
                            

                        
                        

                            
Encoded/Decoded Result

                            
                            

                                
                            

                        

                    

                

            
            
            

                
Base64 Encoder/Decoder

                

                    
Convert text and files to Base64 encoding and decode Base64 back to original format. Supports file uploads and secure data transmission encoding.

                    
Keywords: base64 encoder, base64 decoder, base64 converter, encode file, decode base64, data encoding

                

                

                    

                        

                            
                            
                        
                        

                            

                                

                                    
Text Input

                                    
                                    

                                        
                                        
                                        
                                    

                                

                                

                                    
Base64 Result

                                    
                                    

                                        
                                    

                                

                            

                        

                        
                        

                            

                                

                                    
Select a file to convert

                                    
                                    
                                    

                                

                                

                                    
                                

                                

                                    
Base64 Result

                                    
                                    

                                        
                                    

                                

                            

                        

                    

                

            


            
            

                
Hash Generator

                

                    

                        

                            
                            
                        

                        

                            

                                
Enter Text to Hash

                                
                                

                                    

                                        
                                        
                                    

                                    

                                        
                                        
                                    

                                

                            

                            

                                
Hash Results

                                

                            

                        

                        
                        

                            

                                
Select File to Hash

                                

                                    
                                    
                                    

                                

                                

                                    

                                        
                                        
                                    

                                    

                                        
                                    

                                

                            

                            

                                
Hash Result

                                

                            

                        

                    

                

            


            
            

                
JWT Decoder

                

                    

                        
Enter JWT Token

                        
                        

                            
                            
                        

                    

                    

                        

                            

                                
Header

                                

                            

                            

                                
Payload

                                

                            

                            

                                
Signature

                                

                            

                        

                        

                            
Verify Signature

                            

                                
                                
                            

                            

                        

                    

                

            


            
            

                
Code Formatter

                

                    

                        

                            
                            
                        

                        

                            
                            
                        

                    

                    
                    

                        

                            
Input Code

                            
                            

                                
                                
                            

                        

                        

                            
Formatted Code

                            

                            

                                
                            

                        

                    

                

            


            
            

                
Color Converter

                

                    

                        

                            

                            
                        

                        

                            

                                
                                

                                    
                                    
                                

                            

                            
                            

                                
                                

                                    
                                    
                                

                            

                            
                            

                                
                                

                                    
                                    
                                

                            

                            
                            

                                
                                

                                    
                                    
                                

                            

                        

                    

                

            


            
            

                
Markdown Preview

                

                    

                        

                            
Markdown

                            
                        

                        

                            
Preview

                            

                        

                    

                    

                        
                        
                    

                

            


            
            

                
Regular Expression Tester

                

                    

                        

                            
Regular Expression

                            

                                /
                                
                                /
                                
                            

                            
Test String

                            
                        

                        

                            
Results

                            

                                
Enter a pattern and test string to see results

                            

                            

                                
Matches

                                

                            

                            

                                
Capturing Groups

                                

                            

                        

                    

                

            


            
            

                
JSON Validator & Compare

                

                    

                        

                            
                            
                        

                        

                            

                                
JSON Input

                                
                                

                                    
                                    
                                

                                

                                    

                                        
                                    

                                    

                                

                            

                        

                        
                        

                            

                                

                                    
Original JSON

                                    
                                

                                

                                    
Modified JSON

                                    
                                

                                

                                    
                                    
                                

                                

                                    
Differences

                                    

                                

                            

                        

                    

                

            


            
            

                
Epoch Converter

                

                    

                        
                        

                            
Current Time

                            

                                

                                    Local Time:
                                    
                                

                                

                                    UTC Time:
                                    
                                

                                

                                    Unix Timestamp:
                                    
                                

                            

                        

                        
                        
                        

                            
Epoch to Human Date

                            

                                
                                
                                
                            

                            

                                
                            

                            

                                

                                    
Local Time:

                                    

                                

                                

                                    
UTC Time:

                                    

                                

                                

                                    
ISO-8601:

                                    

                                

                            

                        


                        
                        

                            
Human Date to Epoch

                            

                                
                                
                            

                            

                                
                            

                            

                                

                                    
Unix Timestamp (Seconds):

                                    

                                

                                

                                    
Unix Timestamp (Milliseconds):

                                    

                                

                            

                        

                    

                

            


            
            

                
Timezone Converter

                

                    

                        

                            
Enter Date & Time

                            

                                

                                    
                                    
                                

                                

                                    
                                    
                                

                            

                            

                                
                                
                            

                        

                        
                        

                            
Conversion Results

                            

                                

                                    

                                    

                                    

                                    

                                

                                
                            

                            

                                
                                

                                    
                                    
                                    
                                    
                                    
                                    
                                

                            

                        

                    

                

            


            
            

                
Cron Expression Helper

                

                    

                        

                            
                            
                        

                        

                            

                                
Build Your Cron Expression

                                

                                    

                                        
                                        

                                            
                                            
                                        

                                    

                                    

                                        
                                        

                                            
                                            
                                        

                                    

                                    

                                        
                                        

                                            
                                            
                                        

                                    

                                    

                                        
                                        

                                            
                                            
                                        

                                    

                                    

                                        
                                        

                                            
                                            
                                        

                                    

                                

                                

                                    
Generated Cron Expression

                                    

                                        
                                        
                                    

                                

                                

                                    
Explanation

                                    

                                        This cron expression runs every minute of every hour of every day.
                                    

                                

                                

                                    
Next Execution Times

                                    

                                        
                                    

                                

                            

                        

                        
                        

                            

                                
Understand a Cron Expression

                                

                                    
                                    
                                

                                

                                    
Expression Meaning

                                    

                                        Enter a cron expression above to see its meaning.
                                    

                                

                                

                                    
Expression Breakdown

                                    

                                        
                                            

                                                Field
                                                Value
                                                Meaning
                                            

                                        
                                        
                                            
                                        
                                    

                                

                                

                                    
Next Execution Times

                                    

                                        
                                    

                                

                            

                        

                    

                

            


            
            

                
Image Converter

                

                    

                        
Upload Image

                        

                            
                            
                        

                        

                            
Conversion Options

                            

                                
                                
                            

                            

                                
                                
                                90%
                            

                            

                                
                                
                                

                                    

                                        
                                        
                                    

                                    

                                        
                                        
                                    

                                    
                                

                            

                        

                        

                            
                        

                    

                    
                    

                        
Preview

                        

                            
                            
No image converted

                        

                        

                            
Size: --

                            
Dimensions: --

                        

                        

                            
                            
                        

                    

                

            


            
            

                
Diff Checker

                

                    

                        

                            

                                
Original Text

                                
                            

                            

                                
Modified Text

                                
                            

                        

                        

                            

                                
                                
                            

                            

                                
                                
                            

                            

                                
                            

                        

                        

                            
                            
                        

                        

                            
Differences

                            

                                
                            

                            

                                
                            

                        

                    

                

            


            
            

                
CSS/SCSS Converter

                

                    

                        

                            
                            
                        

                        

                            

                                

                                    
CSS Input

                                    
                                    

                                        
                                        
                                    

                                

                                

                                    
SCSS Output

                                    
                                    

                                        
                                    

                                

                            

                        

                        
                        
                    

                    
                    

                        
About This Tool

                        
This tool helps convert between CSS and SCSS formats. The conversion from CSS to SCSS includes basic nesting and variable extraction, while the conversion from SCSS to CSS is a simplified approximation.

                        
For complete SCSS compilation, consider using a proper SCSS compiler like Sass.

                    

                

            


            
            

                
SQL Formatter

                

                    

                        

                            
                            
                        

                        

                            
                            
                        

                        

                            
                            
                        

                    

                    

                        

                            
Input SQL

                            
                            

                                
                                
                            

                        

                        

                            
Formatted SQL